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grnowFlag for Singapore

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configuration for voip

very new to voip, need assistance for understanding for an office to implement voip.
currently using Linksys ADSL gatewary router, this acts as DHCP, in the network range 192.168.1.x, Has 2 switches not supporting VLANs.

VOIP vendor suggested using HP procurve L2 switch (2 of them). they will configure 2 VLANs, one for data, one for voice on the HP switches.  they suggested using their PABX as DHCP.

please advise
- if we still want to use back our current router as DHCP, what are the configuration that we need to do such that the voip and data works?
- is it advisable to use their PABX acting as DHCP?
- they suggested to have VPN access to troubleshoot, is this advisable and common for voip vendors to have this access?
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Istvan Kalmar
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HI,

Is the route lan leg able to configure dot1q trunk?
There isn't any technical reason why the old DHCP server cannot stay.
You will need to check if you can add scope option 191 for VLAN Autodiscovery.

VPN access to vendors for remote support is common practice.
You define the security so just make sure you only give them the permissions that they need.
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cordeos
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thanks for all the suggestions. please correct my understanging. if we want the ADSL router to act as the DHCP for data and voice, it must be able to configure 2 DHCP servers or DHCP ranges/subnets?  
normal linksys ADSL gateway like WAG120N or WAG160N able to do it?
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PABX able to give static address for IP phones, and able to give address for PC-s...

If he buy firewall or router with VLAN capacity need to divide the responsibility of DHCP to PBX and firewall....
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thanks for all the suggestions, we will go with current router DHCP for data, PABX DHCP for voice.